> On Aug 5, 2014, at 11:13 AM, Allen Wirfs-Brock <allen at
wirfs-brock.com> wrote:
>
> I think this is more or less the strategy we should follow.
>
> All browsers in all modes apparently interpret leading 0 numbers that
contain the digits "8" or "9" as decimal literals. We should make that
part of the base language for ES6.
>
> The ES6 base language should make leading 0 numbers containing only
octal digits ("1"-"7") syntactically illegal.
If the intent is to eventually permit leading 0 numbers as decimal
literals, why forbid unambiguous numbers like `01`–`07` in the meantime?
Many of the websites broken by Firefox's new DecimalIntegerLiteral error
are processing dates like `new Date(2014, 08, 06)`. Permitting `00`–`09`
(with any number of leading zeros) but forbidding ambiguous `01234567`
would be forward-compatible with your plan to eventually permit leading
zeros while not breaking websites using Dates today.
Whether `01234568` would be permitted as decimal 1234568 is a subtler
question.
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